2. It is only when the disease has progressed to AIDS that a person begins to look sick.

只有当这种疾病发展成艾滋病时,人才会显现出病态。

本句中含有It is …that…强调句型, 强调了when引导的时间状语。

It is all the members ______________ held a meeting in the club yesterday.

It was in the bathroom _____________ Joe found his wallet.

It was three years ago _______________ that I first met him.

考点例题:

1) It was ___________ he said ___________ disappointed me.

A. what; that  B. that; that  C. what; what  D. that; what

2) I hate _____ when people talk with their mouths full.

A. it  B. that  C. these  D. then

3)--He nearly died from cancer once?

--When was ________?

--__________ was in 2000 when he was in middle school.

A. that ; It  B. this; This   C. this ; It  D. that; This

4) 用it进行句型转换, 意思不变

a. To keep order in an important football match is a hard job for the police. =

_______________________________________ for the police to keep order in an important football match.

b. Who will take us to visit the nature park hasn’t been decided yet. =

________________________________________ who will take us to visit the nature park.

c. I spend two hours writing the essay. =

________________________________________ to write the essay.

d. They seem to be quarrelling about something.

________________________________________ they are quarrelling about something.

[模拟试题]

(一)用框内所给词组的适当形式完成下列句子。

addict to, on the whole, result in, get into, put up with, as long as,
come about, make a difference, due to, accustom to

1. When I was taken off the school football team because I was too slow, I knew it was time to quit smoking. 当我因为动作太慢而被学校足球队开除时,我认识到是我要戒烟的时候了。

英语中有一些关于it is time…的句式, 如:

(1)It is time for sb. to do sth. 该是某人做某事的时候了。

It is time for us ______________(have)  a rest.

(2)It is (high/about) time that sb. did / should do sth. 是该做某事了(从句中用虚拟语气)

It is high time that I _______________(go) to fetch my daughter.

(3)It is the first/ second/ third etc. time that sb. have done sth. 某人第几次做某事

It is the fourth time that she___________________( ring) you in a week.

拓展:it的基本用法

(1)用作人称代词,代替前文提到过的事物。

The train has arrived. It arrived half an hour ago.

(2)用以代替提示代词this, that。

-What’s this? -It’s a knife.

-Whose watch is that? -It’s mine.

(3)起指示代词的作用,指一个人或事物。

-Who is knocking at the door? -It’s me.

(4)指环境情况等。

It was very noisy (quiet) at the very moment.

(5)指时间、季节等。

-What time is it? -It’s eight o’clock.

It often rains in summer here.

(6)指距离。

It is a long way to the school.

(7)作形式主语。

It is not easy to finish the work in two days.

(8)作形式宾语。

I found it very interesting to study English.

(9)用于强调结构。

It was Xiao Ming whom(that)I met in the street last night.

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